Adding and subtracting machine



(No Model.)

S. J. WEBB.

ADDINGr AND SDBTDAGTING MACHINE.

No. 392,887Jl PatenteQNoN. 13, 1888.

N. PAISES. PmmLnhagr-mner. wm'wingxm. D C

SAMUEL .l1 TVEBB, OF MINDEN, ASSIGNOR OF ONE-HALF TO REUBEN MHKELTJATL, OF SHlEVEPOR-l, LOUISAN.

ADDiNG AND SUBTRACTiNG itfiACiilil.

SPCIFICATON forming part of Letters Patent No 392,837, lated Noveni'eer 13, 1888.

Application filed January ll, Seri-nl o. 5100.102. (n modul) To all when?, it muy concern,.-

Be it known that I, SAMUEL J. Wenn, a citizen of the United States, residing at Miu` den, in the parish of W'ebster, State of Louisiana, -have invented certain new and useful ftlnproveinents in a Combined Adding and Subtraeting Machine, oi' which the following' is a specification, reference being had therein to the accompanying drawings.

This invention has relation to a combined adding and subtracting machine; and the 0bjects and advantages thereof will he hereinafter described, and particularly pointed out in the claims.

'teferring to the drawings, Figure l is a front elcvationof a machine constructed in accordance with my invention. Fig. 2 is acentral section on the'line 2 2 of Fig. l. Fig. 3 is a det-ail in front elevation of the numberingdisks; and Fig. 4- is a vertical section of a modified construction of my invention.

Like letters of reference indicate like parts in all the figures of the drawings.

A represents the casing of the machine, which is formed with sight-panels or openings A, arranged in a series across the easing, and below said openings are :l'ormed a series ol'vcrtical slots, A, the slots corresponding in nu n1- ber with the openings A. XVithin the casing and terminating in each side wall thereof is a lixed cross-shaft, lll, upon which is loosely mounted a series ol' disks, ii', polygonal in cross-section, each having projecting at one side thereof serrated or toothed hubs l B3, Fig. 8, the teeth ol' the former being liner and disposed in a direction opposite to those of the latter, l'or a purpose hereinafter specified.

A ilat spring, C, secured te the casing A, as at C', terminates against and bears upon the disks B', thus providing a tension therefor, it being understood that each disk is provided with a spring, C, as described.

Pivoted to the inner side of the rear wall of the easing A, and projecting through the slots A2 thereof, is a key-lever, D, one foreach of the disks P. A spring, D?, secured to the wall of the casing bears against the undersurface of the latter and retains'the same in its proper position for operation. Pivoted to the lever D, at a point in front of a central line drawn vertically through the axis of the disk B, as shown at D, is a rack-bar, D4, the teeth of which mesh with the toothed collar orhuh l B, and pivoted in rear ot said line, as at D, is a second rack-bar, D, the teeth ot' which correspond in iincness and are adapted to operatein the toothed portion Blof the toothed hub. A push-rod, D, projects from iherear of the machine, and pivot-cd to its rear end are long and shortswitch-bars D"3 D, theouter ends of which are slotted and loosely connected by pins Dmto the rack-bars D* D,respectively. A light spring, D, may be connected to the casing to bear lightly against the trout face ol" the rack-bar D, and retain said bnr in working contact with the toothed collar B3, and a similar spring, Dm, projects from the casing against the rear face of the rack-bar D.

A ny number of disks B may be employed, and in this instance l have deemed it sufficient for clear illustration to use only four. The disks represent units, tens, hundreds, and thousands, commencing with the one at the right, each of said disks being provided upon its face with a series of numerals ranging from 0 to f), and each series oi' numbers being arranged in an order opposite to those on the disk adjacent, as shown in Fig. 3. A series ol` pegs or pins, I3', corresponding in ni'nnbcr to the numerals are arranged upon and radiatey from the peripheries ol' the disl ll'aud at one l. Upon the opposite face of each side ihereoi disk and. extending i'rom the side wall thereol', and opposite to the sccro,(or 0,)is an L-shapcd pin,

Depending troni ashai't, l,a|i i intermediate each ol' the pairs ol' disks Il', is a looselymounted star or spur wheel, ii, which meshes with the series oi' pin l and is in the path of the L-shaped pin H. laking the disks,for instance, in the position as shown in Fig. 3 ol" the drawings, in which there would appear the total of nine hundred and nine, we will suppose that it is desired Vto snotraet one. .ly pressing upon the key D, companion to the units--disl--whiehis the one at the right ofthe serics-said key will deseend,car ying with it the rack-bar D, which will turn, through the medium ofthe toothed collar l, the disk ll/ one notch, so as to bring the numeral S opposite the sight-panel in the units place and the total will be nine hundred and eight.

As thus far described it is apparent that by four disks herein shown a total up to nine thousand nine hundred and ninety-nine may be obtained. By a reference to Fig. 2 of the drawings it will be seen that by pressing the push-rod D7 inwardly the rack-bar Dis thrown out of operative position with its toothed collar B3, and the opposite rack-bar, D, thrown into operative position with its toothed collar 13.2 rIhe machine in this position is adapted for addition. Now, taking the parts as indicated, suppose, for example, it is desired to add two to the total, nine hundred and nine. By pressing upon the units key-lever so as to cause the disk D to rotate backward two degrees the numeral 1 is brought to sight, thus making the total nine hundred and eleven. As the disk turns, the L-shaped pin B5 will come in contact with and cause the spur E to sired, I may omit the rack-bar DG and the shifting mechanism described, or vice versa, thus adapting the machine for subtraction or addition.

An arm, F, pivoted to the base of the machine, as at F', and formed with an operative crank, F2, may be provided, whereby when swung in a vertical position it wedges under the keys or levers D, thus preventing accidental movement of the levers and consequent disturbance of the total.

As shown in Fig. 4L ofthe drawings,whieh is a modification ofthe arrangement ofthe operating mechanism, it willbe seen that the bar D is formed longer than in the previous construction, and that there extends upwardly therefrom,orit maybe, bearslooselythereon, aseries of keys, D, mounted in a key-board, thekeys being graduated in length and growing shorter as they approach the outer end of the bar. By a suitable proportioning and mounting of the keys with relation to the point of pivotal attachment of the lever D each key may be made to throw the numeral on thc disk to which it belongs to the opening, so thatif it is desired to add or subtract a nine the key representing that numeral which would be the longestand one nearest the pivot ofthe lever D is struck,and this causes the disk to rotate nine degrees,thus avoiding the necessity of counting the number of spaces passed, which is the ease where but a single lever is used for each disk.

Itis apparent that by changing the order of the numerals as arranged upon the faces of the disks the operations necessary to add and subtract may be reversed.

Having described my invention and its operation, what I claim is- 1. In a machine of the class described, a series of disks provided with a hub having oppositely-disposed teeth, in combination with a key-lever carrying pivoted rack-bars, one for each set of teeth, and means for throwing either of said rack-bars into or out of connection with said collar, substantially as specified.

2. In a machine of the class described, a series of disks mounted upon a shaft and having oppositely-disposed toothed hubs, in combination with a key-lever carrying two rack-bars adapted to engage with said hubs,and a pushrod having pivoted levers loosely connected with the rack-bars, whereby either may be thrown into and out of connection with the hubs, substantially as speciiied.

3. The casing A, having the openings A, and vertical slots A?, in combination with the shaft B, carrying the disks B, arranged opposite the openings A' ofthe casing and having toothed hubs B2 B3, and the key-levers B, carrying rack-bars DL D6, the push-rod D7,and the switch-bars D8 D, loosely connected with said rack-bars, substantially as specified.

4. The casing A, having the disks B', the shaft B, carrying the sleeves B2 B3, in combination with the key-lever D, pivoted as at D to the casing, the spring D, bearing against said lever, the pivoted rack-bars D* D, having the springs D11 D, respectively, and the switch-bars Da D, loosely connected with said rack-bars, as at D10, and having their opposite ends pivoted to a push-rod, D7, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL J. VEB B.

lVitnesses:

W. S. DUVALL, HEATH SUTHERLAND. 

